The city disclosed results from two months of balloting, which ended July 11. Judge Steven Rhodes still must hold a trial in August to determine if Detroit's overall bankruptcy plan is fair and feasible to all creditors, from Wall Street to Main Street, but support from retirees is vital.

"It's clearly a victory for the city," said Anthony Sabino, a bankruptcy expert who teaches business law at St. John's University in New York. "It will pave the way for a confirmation hearing. Detroit will be able to move forward, not with absolute financial certainty but far more than Detroit has enjoyed in decades."

General retirees would get a 4.5 percent pension cut and lose annual inflation adjustments. They accepted the changes with 73 percent of ballots in favor. Retired police officers and firefighters would lose only a portion of their annual cost-of-living raise. More than 80 percent in that class voted "yes."

The counting was done by a private company.

Approval of the pension changes triggers an extraordinary $816 million bailout from the state of Michigan, foundations and the Detroit Institute of Arts. The money would prevent the sale of city-owned art and avoid deeper pension cuts. The judge, however, still must agree.

"It's absolutely unprecedented in a bankruptcy," Sabino said.

There are tens of thousands of creditors in Detroit's $18 billion bankruptcy, from bond holders to businesses that provide soap, but much of the focus of the last year has been on the roughly 32,000 retirees and current and former workers banking on a pension. They have put a real and often anguished face on the process.

The average annual pension for police and fire retirees is $32,000, while most other retired city workers get $19,000 to $20,000. Detroit emergency manager Kevyn Orr has said pension changes are unfortunate but necessary because two pension funds are underfunded by billions. If investment performance improves in the years ahead, he said, the cuts could be restored.

"I want to thank city retirees and active employees who voted for casting aside the rhetoric and making an informed positive decision about their future and the future of the city," Orr said in a statement late Monday.

The Michigan Constitution says public pensions can't be cut, but Rhodes, in his most significant decision in the case, said in December that federal bankruptcy law trumps that shield. It was a groundbreaking opinion that could influence local governments across the country that go broke.

Michigan Attorney General Bill Schuette believes Rhodes is wrong, but he has said that he probably wouldn't appeal the decision if retirees voted for the cuts.

Separately on Monday, a Boston-based restructuring expert hired to advise the judge said Detroit's overall bankruptcy plan is "feasible," a key standard at the upcoming trial. But Marti Kopacz warned that antiquated computer systems, a pledge to spend more than $1 billion to improve services after bankruptcy and a "cultural malady" among workers all will be challenges.

"There are ... employees who don't grasp that their job is to provide a service to the taxpayers versus the taxpayers owing them a job," Kopacz said in a report released Monday.

He told CBS Detroit radio station WWJ the vote is "definitely good news as it relates to the Grand Bargain. I know that there are a lot of retirees who don't believe that this is a good deal, but the overwhelming turnout, that vote shows that the retirees wanted to protect themselves from further harm."

Plecha said that, even though pensioners aren't thrilled about having to take part in the cuts, the response has been generally positive. "There was an understanding that what could come from a 'no-vote' and a cram down scenario was exponentially worse," Plecha said.

"I just think that this is a momentous point in the bankruptcy process," Plecha continued. "But, it's only one piece of the puzzle and there's still more to be placed together before the city can exit bankruptcy and rebuild and there's still challenges to ensure that the retirees are protected from additional harm."